Belt milling and grinding machine



Dec. 15, 1942. o. D. PREMO 2,305,107

BELT MILLING AND GRINDING MACHINE Filed NOV. 12, 1940 4 Sheets-Sheet lATTORNEYS.

- Dec. 15, 1942. o. D. PREMO BELT MILLING AND GRINDING MACHINE FiledNov. 12, 1940 4 Sheets-Sheet 2 W MWR Owen/Z. Fi er/Z0 IN VEN TOR.

ATTORNEYS.

Dec. 15, 1942. o. DHPREMO 0 BELT MILLING AND GRINDING MACHINE Fi'ledNov. 12, 1940 4 Sheets-Sheet 3 0zuerz'J.Pfle2/0 INVENTOR.

A TTORN E YS.

Decl15y1942. o. D. PREMOV 2,305,107

BELT MILLING AND GRINDING momma Filed Nov. 12, 1940 4 Sheets-Sheet 4ATTORNEYS.

Patented Dec. 15, 1942 UNITED STATES PATEN OFEIQE- :BELT GRINDINGMACHINE Owen D. vPremo, Muskegon Heights, Mich.

I Application November 12, 1940, Serial No. 365,363

3 Claims.

"less strip of abrasive cloth operates, the driving wheels and idlerwheels 'beingmounted in such a 'way that radial movement of the drivingwheels will result in a relative movement of the idler wheels in theopposite direction, maintaining the strip of abrasive cloth taut at alltimes, and

insuring the true operation of the machine. Another object of theinvention is to provide a yieldable support for the driving wheels topermit the driving wheels to move independently 'of each other tocompensate for enlargements =r irregularities which may .be present onthe surface under treatment. 7

'With the foregoing and other objects in view, which will appear as thedescription proceeds, f the'in'vention resides in'the combination andar- 'rangement of parts and in the details of '-construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein described, may be made within thescope of what is claim-ed, without departing from the spirit of theinven- 'tion. I

Referring to the drawings:

Figure 1 is a sectional view through a grinding machine constructed inaccordance with the invention.

Figure 2 is a sectional view through a tube, showing the grindingmachine as positioned therein, the grinding machine being shown in "endelevation. V

Figure 3 is a sectional view taken on line 3-3 of Figure '2.

Figure 4 is a longitudinal sectional view through amodified form of theinvention.

Figure 5 is an endelevational view-of 'the' forrn of grinding machine asillustrated by Figure 4 of the drawings.

Figure 6 is a sectional View taken on line 5-5 of Figure 4.

Referring to the drawings in detail, the reference character 5designates the power shaft of the machine, and as shown, the power shaftoperates in bearings formed at the ends of the tubular housing 6 whichis formed with teeth I that mesh with the teeth of the gear 8 mounted:on the shaft 9. "Thus it will be seen that when the shaft 9 is rotated,the machine will be advanced or retracted from the tubular member beingground or resurfaced.

A gear indicated at It! is keyed to .one end of the shaft 5, the gear Itbeing in mesh with the worm ll operated by a suitable power device notshown. I

The forward end of the power shaft 5 islsecured within the sleeve IIthat in turn is secured to the gear housing !'2 :by means of the bolts13.

The gear housing 12 is provided with openings for the reception of thetubular extensions 1J4, which are keyed in the openings so that thetubular extensions I4 rotate with the gear housing I 2. These extensionsM are formed -on the inner ends of the arms that are provided withbearings 16 in which the shafts I-l operate, the shafts 11 providingsupports for the wheels 1'8 over which the endless strip of abrasivema-- ter ial I 9 operates.

Mounted on the inner ends of the shafts 1 1 are pinions 20 that meshwith the pinions 2-! that are secured to the outerends of the'shafts 2.2that operate within the extensions M. These shafts 2 2 are formed withbores extending from :the inner ends thereof, the bores providing seatsfor the shafts '23 formed on the pinions 2'4, the shafts .23 beingsplined within the bores of the shaft 2 2. Coiled springs indicated at25 are mounted within the bores of the shaft 22 and have their innerends "bearing against the shaft :23. It will of course be understoodthat the tubular extensions 14 are splined within the gear housing it,so that the arms d5 together with the tubular extensions M, willhe urgedoutward ly, under the action of the coiled spring 25.

As clearly shown by Figure 1 of the drawings, the inner ends of thetubular extensions i''are formed with threads to accommodate the threads:of the adjusting nuts Z-Ethat bear against the gear housing 12. Due tothis construction, it

:will be seen -t-h-at adjustment of the -15, to-

wards and away from the work, may be accom plished. Y

The pinions 24 mesh with teeth 21 formed at the inner end of the housing6, with the result that as the gear housing I2 rotates, rotary movementwill be imparted to the pinions 24, rotating the shafts 22. Rotarymovement of the shafts 22 will cause a relative rotary movement of thepinions 2| that in turn rotate the pinions 2|] transmitting rotarymovement to the Wheels [8 and strip of abrasive cloth operatingthereover. As clearly shown by Figure 2 of the drawings, the wheels I 8are supported directly opposite to each other, and between the wheelsare idler wheels indicated at 21' which idler wheels are mounted on theshafts 28 that are carried by the arms 29 that in turn are mounted onthe gear housing l2, the arms 29 having extensions 30 splined inopenings ofthe housing [2. Bores are formed in the bolts 3| that securethe arms 29 within the housing 6, the bores accommodating the coiledsprings 32 that bear against the shafts 33 shown as extending into thebores. The inner ends of the extensions 30 are threaded to accommodatethe adjusting nuts 34, whereby the arms 29 may be adjusted with respectto the gear housing. In the adjustment shown by Figure 3 of thedrawings, it will be seen that the arms 29 may move outwardly until thenuts 34 contact with the gear housing to restrict movement of the arms.This movement takes place when irregularities are encountered on thesurface being treated, and which irregularities cause an inward movementof the strip of abrasive cloth and wheels over which the abrasive clothmoves and is held against the surface under treatment. Due to thisconstruction, the endless strip of abrasive cloth is held taut at alltimes. It might be further stated that the idler wheels are grooved toguide the endless strip of abrasive cloth and prevent the strip fromrunning laterally off of the wheels I8. In the drawings, I haveillustrated pairs of wheels over which the strips of abrasive clothoperate, but in view of the fact that the construction of the variouswheels and supports at opposite sides of the machine are identical, onlythe wheels at one side of the machine have been described in detail.

In the form of the invention as shown by Figure 4 of the drawings, thepower shaft is indicated by the reference character 5', and the housingin which the shaft operates is indicated at 6'. The shaft 5 is providedwith a gear H) at its outer end, by means of which power is transmittedto the shaft 5'. The worm I I meshes with the gear l to rotate the gearIII.

A gearing housing indicated at 36 is mounted on the inner end of theshaft to rotate therewith. The gear housing is provided with threadedopenings in which the verniers are mounted, the verniers providingsupports for the hollow shafts 3! on which the grinding heads 38 aremounted. Coiled springs 39 are mounted within the hollow shafts 31 andact to urge the shafts 31 and their heads 38, outwardly. The inner endof the housing 6' is formed with teeth 40 that mesh with the teeth ofthe pinions 4| operating at the inner end of the shaft 5'. Stub shafts42 extend from the gears 4| and are provided with slots extendinginwardly from the outer ends thereof, the slots accommodating pins 43that extend through the shafts 31, slidably connecting the shafts 31 tothe stub shafts. By adjusting the verniers, the grinding or millingheads may be properly positioned within a hollow or tubular article tobe ground or milled, and irregularities encountered by the heads, duringthe grinding or milling operation will cause an inward movement of theheads, resulting in a true grinding or milling of the surface.

In the operation of the device, it will be seen that the machine ispositioned within the member to be treated, and the power shaft is setin motion. As the power shaft rotates the gear housing the abrasiveelements of the machine will be rotated accomplishing the purpose of thinvention. During the grinding operation, the abrasive elements are fedthrough the object under treatment, by a suitable means not shown.

What is claimed is: a

1. A surface treating machine, comprising a shaft housing, gear teethformed at the inner end of the housing, a power shaft extending throughthe housing, a gear housing mounted at the inner end of the shaft, andhaving openings in the periphery thereof, a sleeve secured to the gearhousing and into which one end of the power shaft extends, and issecured, said sleeve having bearings, pinions mounted in said bearings,shafts extending from said pinions, arms providing supports forsurface-treating members, hollow extensions on the arms mounted withinthe openings of the gear housing, hollow shafts disposed within thehollow extensions, the shafts extending from the pinions being splinedwithin the hollow shaft, coiled springs mounted within the hollow shaftsand adapted to bear against the shafts of said pinions normally urgingsaid arms and surfacetreating members carried thereby, outwardly, saidgear teeth at the inner end of the housing en'- gaging said pinions andadapted to rotate the pinions and shafts connected therewith, when thepower shaft rotates.

2. A machine for treating surfaces, comprising a shaft housing, gearteeth formed at the inner end of the shaft housing, a power shaftextending through the housing, a gear housing mounted at the inner endof the shaft, a sleeve extending into the gear housing and beingconnected to the gear housing, pinions mounted on the sleeve, shaftsextending from the pinions, said pinions being in mesh with the gearteeth of the shaft housing to receive motion therefrom, means forsupporting rotary surface-treating members on the gear housing, saidmeans embodying'arms and tubular extensions on the arms, tubular shaftsmounted in the extensions and to which the shafts of said pinionsextend, coiled springs in the tubular shafts and bearing against thepinion shafts and the outer ends of the sleeves normally urging thetubular shafts outwardly, and means for limiting the outward movement ofthe arms and surfacetreating members carried thereby.

3. A surface treating machine, comprising a power shaft, a gear housingmounted at the inner end of the power shaft, surface treating members,arms on which said surface treating members are supported, means forsupporting the arms within the gear housing, said means comprisingtelescoping members, and springs disposed within the telescoping membersadapted to move one member with respect to the other member urging thesurface treating members to their work, andmeans for transmittingmovement of the power shaft to the surface treating members.

OWEN D. PREMO.

